byte_swap.h revision 1.2.2.2
1 1.2.2.2 thorpej /* $NetBSD: byte_swap.h,v 1.2.2.2 2002/08/19 21:39:13 thorpej Exp $ */ 2 1.2.2.2 thorpej 3 1.2.2.2 thorpej /*- 4 1.2.2.2 thorpej * Copyright (c) 1997, 1999, 2002 The NetBSD Foundation, Inc. 5 1.2.2.2 thorpej * All rights reserved. 6 1.2.2.2 thorpej * 7 1.2.2.2 thorpej * This code is derived from software contributed to The NetBSD Foundation 8 1.2.2.2 thorpej * by Charles M. Hannum, Neil A. Carson, and Jason R. Thorpe. 9 1.2.2.2 thorpej * 10 1.2.2.2 thorpej * Redistribution and use in source and binary forms, with or without 11 1.2.2.2 thorpej * modification, are permitted provided that the following conditions 12 1.2.2.2 thorpej * are met: 13 1.2.2.2 thorpej * 1. Redistributions of source code must retain the above copyright 14 1.2.2.2 thorpej * notice, this list of conditions and the following disclaimer. 15 1.2.2.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.2.2 thorpej * notice, this list of conditions and the following disclaimer in the 17 1.2.2.2 thorpej * documentation and/or other materials provided with the distribution. 18 1.2.2.2 thorpej * 3. All advertising materials mentioning features or use of this software 19 1.2.2.2 thorpej * must display the following acknowledgement: 20 1.2.2.2 thorpej * This product includes software developed by the NetBSD 21 1.2.2.2 thorpej * Foundation, Inc. and its contributors. 22 1.2.2.2 thorpej * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.2.2.2 thorpej * contributors may be used to endorse or promote products derived 24 1.2.2.2 thorpej * from this software without specific prior written permission. 25 1.2.2.2 thorpej * 26 1.2.2.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.2.2.2 thorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.2.2.2 thorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.2.2.2 thorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.2.2.2 thorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.2.2.2 thorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.2.2.2 thorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.2.2.2 thorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.2.2.2 thorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.2.2.2 thorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.2.2.2 thorpej * POSSIBILITY OF SUCH DAMAGE. 37 1.2.2.2 thorpej */ 38 1.2.2.2 thorpej 39 1.2.2.2 thorpej #ifndef _ARM_BYTE_SWAP_H_ 40 1.2.2.2 thorpej #define _ARM_BYTE_SWAP_H_ 41 1.2.2.2 thorpej 42 1.2.2.2 thorpej #include <sys/types.h> 43 1.2.2.2 thorpej 44 1.2.2.2 thorpej static __inline u_int32_t 45 1.2.2.2 thorpej __byte_swap_32_variable(u_int32_t v) 46 1.2.2.2 thorpej { 47 1.2.2.2 thorpej u_int32_t t1; 48 1.2.2.2 thorpej 49 1.2.2.2 thorpej t1 = v ^ ((v << 16) | (v >> 16)); 50 1.2.2.2 thorpej t1 &= 0xff00ffff; 51 1.2.2.2 thorpej v = (v >> 8) | (v << 24); 52 1.2.2.2 thorpej v ^= (t1 >> 8); 53 1.2.2.2 thorpej 54 1.2.2.2 thorpej return (v); 55 1.2.2.2 thorpej } 56 1.2.2.2 thorpej 57 1.2.2.2 thorpej static __inline u_int16_t 58 1.2.2.2 thorpej __byte_swap_16_variable(u_int16_t v) 59 1.2.2.2 thorpej { 60 1.2.2.2 thorpej 61 1.2.2.2 thorpej __asm __volatile( 62 1.2.2.2 thorpej "mov %0, %1, ror #8\n" 63 1.2.2.2 thorpej "orr %0, %0, %0, lsr #16\n" 64 1.2.2.2 thorpej "bic %0, %0, %0, lsl #16" 65 1.2.2.2 thorpej : "=r" (v) 66 1.2.2.2 thorpej : "0" (v)); 67 1.2.2.2 thorpej 68 1.2.2.2 thorpej return (v); 69 1.2.2.2 thorpej } 70 1.2.2.2 thorpej 71 1.2.2.2 thorpej #ifdef __OPTIMIZE__ 72 1.2.2.2 thorpej 73 1.2.2.2 thorpej #define __byte_swap_32_constant(x) \ 74 1.2.2.2 thorpej ((((x) & 0xff000000) >> 24) | \ 75 1.2.2.2 thorpej (((x) & 0x00ff0000) >> 8) | \ 76 1.2.2.2 thorpej (((x) & 0x0000ff00) << 8) | \ 77 1.2.2.2 thorpej (((x) & 0x000000ff) << 24)) 78 1.2.2.2 thorpej 79 1.2.2.2 thorpej #define __byte_swap_16_constant(x) \ 80 1.2.2.2 thorpej ((((x) & 0xff00) >> 8) | \ 81 1.2.2.2 thorpej (((x) & 0x00ff) << 8)) 82 1.2.2.2 thorpej 83 1.2.2.2 thorpej #define __byte_swap_32(x) \ 84 1.2.2.2 thorpej (__builtin_constant_p((x)) ? \ 85 1.2.2.2 thorpej __byte_swap_32_constant(x) : __byte_swap_32_variable(x)) 86 1.2.2.2 thorpej 87 1.2.2.2 thorpej #define __byte_swap_16(x) \ 88 1.2.2.2 thorpej (__builtin_constant_p((x)) ? \ 89 1.2.2.2 thorpej __byte_swap_16_constant(x) : __byte_swap_16_variable(x)) 90 1.2.2.2 thorpej 91 1.2.2.2 thorpej #else 92 1.2.2.2 thorpej 93 1.2.2.2 thorpej #define __byte_swap_32(x) __byte_swap_32_variable(x) 94 1.2.2.2 thorpej #define __byte_swap_16(x) __byte_swap_16_variable(x) 95 1.2.2.2 thorpej 96 1.2.2.2 thorpej #endif /* __OPTIMIZE__ */ 97 1.2.2.2 thorpej 98 1.2.2.2 thorpej #endif /* _ARM_BYTE_SWAP_H_ */ 99
Indexes created Wed Oct 22 13:09:56 GMT 2025